Aggregation states and molecular motion in amphiphilic poly(amido amine) dendrimer monolayers on solid substrates

Keiji Tanaka; Shiyu Dai; Tisato Kajiyama; Keigo Aoi; Masahiko Okada

doi:10.1021/la0261592

Aggregation states and molecular motion in amphiphilic poly(amido amine) dendrimer monolayers on solid substrates

Keiji Tanaka, Shiyu Dai, Tisato Kajiyama, Keigo Aoi, Masahiko Okada

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

Monolayers of third-generation amphiphilic poly(amido amine) (PAMAM) dendrimer were prepared at the air/water interface and then were successfully transferred onto silicon wafers by a horizontal lifting method. A comprehensive characterization of the PAMAM monolayers was made, structurally and dynamically, by scanning force microscopy in conjunction with X-ray reflectivity and X-ray photoelectron spectroscopy. The PAMAM molecules sit on the substrate with an oblate shape, in which hydrophilic core and hydrophobic alkyl end groups were toward substrate and air sides, respectively. In the PAMAM monolayers, distinct three, α_a-, α_H(2)O- and δ-, relaxation processes were observed on lateral force-temperature curves. They were assigned to segmental motion, plasticized segmental motion by residual water molecules, and a local mode relaxation, respectively.

Original language	English
Pages (from-to)	1196-1202
Number of pages	7
Journal	Langmuir
Volume	19
Issue number	4
DOIs	https://doi.org/10.1021/la0261592
Publication status	Published - Feb 18 2003

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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abstract = "Monolayers of third-generation amphiphilic poly(amido amine) (PAMAM) dendrimer were prepared at the air/water interface and then were successfully transferred onto silicon wafers by a horizontal lifting method. A comprehensive characterization of the PAMAM monolayers was made, structurally and dynamically, by scanning force microscopy in conjunction with X-ray reflectivity and X-ray photoelectron spectroscopy. The PAMAM molecules sit on the substrate with an oblate shape, in which hydrophilic core and hydrophobic alkyl end groups were toward substrate and air sides, respectively. In the PAMAM monolayers, distinct three, αa-, αH(2)O- and δ-, relaxation processes were observed on lateral force-temperature curves. They were assigned to segmental motion, plasticized segmental motion by residual water molecules, and a local mode relaxation, respectively.",

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T1 - Aggregation states and molecular motion in amphiphilic poly(amido amine) dendrimer monolayers on solid substrates

AU - Tanaka, Keiji

AU - Dai, Shiyu

AU - Kajiyama, Tisato

AU - Aoi, Keigo

AU - Okada, Masahiko

PY - 2003/2/18

Y1 - 2003/2/18

N2 - Monolayers of third-generation amphiphilic poly(amido amine) (PAMAM) dendrimer were prepared at the air/water interface and then were successfully transferred onto silicon wafers by a horizontal lifting method. A comprehensive characterization of the PAMAM monolayers was made, structurally and dynamically, by scanning force microscopy in conjunction with X-ray reflectivity and X-ray photoelectron spectroscopy. The PAMAM molecules sit on the substrate with an oblate shape, in which hydrophilic core and hydrophobic alkyl end groups were toward substrate and air sides, respectively. In the PAMAM monolayers, distinct three, αa-, αH(2)O- and δ-, relaxation processes were observed on lateral force-temperature curves. They were assigned to segmental motion, plasticized segmental motion by residual water molecules, and a local mode relaxation, respectively.

AB - Monolayers of third-generation amphiphilic poly(amido amine) (PAMAM) dendrimer were prepared at the air/water interface and then were successfully transferred onto silicon wafers by a horizontal lifting method. A comprehensive characterization of the PAMAM monolayers was made, structurally and dynamically, by scanning force microscopy in conjunction with X-ray reflectivity and X-ray photoelectron spectroscopy. The PAMAM molecules sit on the substrate with an oblate shape, in which hydrophilic core and hydrophobic alkyl end groups were toward substrate and air sides, respectively. In the PAMAM monolayers, distinct three, αa-, αH(2)O- and δ-, relaxation processes were observed on lateral force-temperature curves. They were assigned to segmental motion, plasticized segmental motion by residual water molecules, and a local mode relaxation, respectively.

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Aggregation states and molecular motion in amphiphilic poly(amido amine) dendrimer monolayers on solid substrates

Abstract

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